I have a P5550E generator. Can I install a different muffler to quiet it down?
Make: Cummins onan
This is a question that is asked often. The answer is "YES" and "NO". I understand that this may be a confusing answer.
But in reality, YES you can install a different muffler, but if you do you will run the risk of burning the valves in the engine.
The mufflers that are installed on the engine are carefully calculated for the amount of back-pressure that the particular engine requires. If a different muffler is installed, it will usually increase the amount of back-pressure and this will in turn cause the engine to run too hot....burning the valves an overheating the engine..causing other issues even engine failure.
We have been asked if a customer could put a pipe extension on the unit to route the exhaust farther away, maybe under the RV, but again, the longer the pipe, the more back-pressure and the more likely it will overheat and burn the valves and other parts of the engine.
Most of the time, we suggest that you DO NOT change mufflers or exhaust systems because of this.
If you are still interested in quieting down the unit, I suggest that you take it to a Authorized dealer and have them see if they can come up with something that will be in the same back-pressure range.
I understand that this is not the exact answer that you were looking for, but it is the best answer I can give you right now.
If I find out anything more, I will try to contact you at a future date.
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I Own a Lawn Mower Sales and service business (37years). Have 2-cycle and 4-cycle certification.